Questions tagged [subpanel]

For questions about an [electrical-panel] that is fed from another [electrical-panel] instead of being fed directly by a utility service or separately derived service (such as a generator or inverter).

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1answer
430 views

Is a Redundant Ground at Sub-Panel Permitted? Useful?

I've searched the forum and haven't found an answer for this exact situation. Here's the configuration: Main 200A service panel at one end of house (exterior), and 100A sub panel at opposite end of ...
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3answers
624 views

Installing a sub panel to a GE split bus panel

I want to install a sub panel to my GE split bus panel. The diagram indicates that I could replace the two full sized 2-pole breakers (2 inch wide each) on the upper left with three compact 2-pole ...
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1answer
114 views

How can I connect a sub-panel to an unused 60A breaker in another panel?

So I have a contractor installing a gas furnace where I used to have an electric furnace. I am ending up with a 60a circuit that is not needed anymore. I want to take that circuit and install a ...
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2answers
4k views

100 AMP sub panel from 200 AMP main

Installing a new sub panel in my detached garage, about 90' from the main panel. Half of the distance of the run will be under the house and the second half underground to the garage. I have read that ...
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1answer
884 views

Should I make space for a new 50A breaker in a full panel or install a sub-panel?

I'll start by saying we just bought a fixer-upper house. I searched the topic of adding sub panels and a lot of the answers are a bit over my head so I need some advice. My house was built in the 20'...
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2answers
952 views

Is it possible to make space for a double-pole breaker in this panel?

I need to add a 90A double-pole breaker to the service panel on my house to feed a subpanel in a detached garage. It is a GE that uses Q-line breakers. Looking at the current layout, I'm not sure it ...
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3answers
3k views

Is 8/3 stranded wire ok to power a 100amp subpanel?

I have an old 220 (8/3 stranded with grnd) line off the main box from a stove that I don't use anymore (we have gas now). I want to use it to install a subpanel in my attic. The subpanel is 100amp, 6 ...
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1answer
255 views

Calculating sub panel capacity

I am creating a sub panel which will contain 20, 20 AMP circuits to provide power for 20, 1,000 watt, 120v stage lights. My calculations suggest that the light loads, which are constant, will require`...
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1answer
1k views

What type of wire and load center for subpanel in detached pole garage?

I am installing a 60 AMP subpanel in a detached pole garage 150 feet from the house. Garage subpanel will be supplied from an existing 100 AMP subpanel in the basement of the house (running from the ...
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3answers
2k views

Adding a sub panel in my basement

I want to add a sub panel in my basement. The main panel is in my garage, the next level up. The distance from the main panel is roughly 10 feet. The main power comes in through the basement and up to ...
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2answers
304 views

Move grounds to subpanel when I moved 8 single pole breakers to same subpanel?

When I move 8 breakers from main panel to a subpanel (a few feet away) can I simply move the hot and neutral only to subpanel? The 8 breakers are grounded in the main panel already. A 100 amp breaker ...
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0answers
112 views

Questions about installing an electrical subpanel (re: wire size, etc)

My current electrical panel is filled and I'm going to have a pool installed this year so I need to install a subpanel. (my current box doesn't support tandem breakers, etc) Because I only need more ...
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1answer
394 views

Does a sub-panel require its own local main breaker?

When one goes to install an electrical subpanel is it required to install a "main" breaker in the subpanel to shut off all the circuits in the panel? Or is it sufficient to just have the feeding ...
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2answers
725 views

Wiring 100 Amp subpanel

I know this subject seems to be debated to no end but I have a few questions/comments. My main service panel is in my attached garage and I want to add a 100 amp subpanel about a foot or 2 to the ...
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2answers
3k views

Considering doing a 100A sub panel install on my own. Any guidance would be much appreciated

My background: I am an Electrical Engineer by schooling and I'm a pretty handy guy overall. I have been working on and around just about everything since as long as I can remember. I have a good grasp ...
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4answers
7k views

Space requirements for first subpanel and wiring preference

I would like to install two subpanels and my main panel is full of breakers. Would it be better to feed both subpanels directly from main or have 1st subpanel off main and 2nd subpanel off 1st ...
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1answer
183 views

Installing a sub panel

Installing a sub panel solely for outdoor Christmas lights/decorations. I will need approximately 120 amps now, with more to be added later. My current main panel does not have enough open slots for ...
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2answers
358 views

Should the neutral be bonded in my barn's sub-panel?

I moved into a house with a barn. The barn has a 100 Amp panel. It feeds from a Main Entry 100A breaker in the Entry's box. There are 3 wires to the sub. Ground and 2 hot. The subpanel in the barn ...
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1answer
979 views

Fastening THHN cable in junction box

I am installing an electrical subpanel in my garage and have a 2" PVC conduit run up approximately 5 feet from the panel through the ceiling to the garage attic. In the conduit i ran 2 12/2 NM romex ...
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1answer
2k views

Can I use #6 wire to feed a sub panel off main

I have a 200amp service, thats loaded with twins, my son just bought house, anyway I want to put a 100amp sub panel inside basement off the main panel, the run is nomore than 20', I have about 50' of #...
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1answer
299 views

Adding ground to replacement sub panel

We recently purchased a new home that has a 16 x 30 steel building in the back yard approximately 100ft from the main panel. The building has power run to it off a 60 amp breaker in the main panel. ...
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3answers
139 views

Can the Distance of a Subpanel affect Outlet Tester Results

I got help with wiring my cabin here: Requesting Evaluation of Power Plan at Rural Cabin and here: Cabin Wiring Plan Revisited I also put a follow up comment there, but now I'm not sure that was the ...
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2answers
360 views

Cabin Wiring Plan Revisited

OK, So I’ve update my wiring plan … see images. I have more details now, such a part numbers, specifications and ratings, etc. I’ve consolidated much input from a couple of forums as well as Stack, ...
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3answers
1k views

Is this double tap for a subpanel a problem?

I've been reading posts but am still a little confused on this as each situation is slightly different and I am not familiar with the terminology. Main breaker has two larger wires coming into it. ...
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1answer
7k views

Can I use a 30A backfeed breaker when I'm not using the generator?

I have a panel in my garage with a "Generator" 30A breaker. I know I shouldn't be backfeeding the generator (I inherited this setup and am scheduling an electrician to put in a transfer switch). ...
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2answers
837 views

How do I go about installing a subpanel on wood paneling that's mounted to a concrete wall?

I've been reading, researching, watching, and preparing to install a sub-panel (which I'll be having a licensed electrician inspect and sign off on before going live) and I think I know how to go ...
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1answer
732 views

Need advice about rewiring detached garage

I have an old house (1955) with two overhead wires going from the house to the detached garage (15') where they connect to an old fuse box (picture) My first question: how does this work? Two wires ...
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2answers
53 views

Wiring the out building

I have 2-2-2-4 AL dyke quadruplex direct burial 600v. with AC/heater wall unit. with about 9 plugs. a small hot water heater. and 9 can lights. is a 60amp breaker big enough. Also the wire is running ...
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1answer
2k views

Is it bad to have a circuit breaker on both ends of a feeder?

My main service panel only has a single breaker connected to a feeder wire which goes to my subpanel. I'd like a main disconnect closer to my subpanel so I don't have to go all the way to my main ...
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3answers
13k views

wire size for a 150 amp sub panel from a 150 amp breaker added to a 400 amp main panel

I have a 400 amp Siemens main panel it has a 200 Amp breaker to the house and a secondary 150 amp breaker added to run power to a metal building approximately 150 feet from the main. what size wire ...
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6answers
34k views

Can I connect a 100A subpanel to a 100A main panel?

I currently have a 100amp main service box but it is all full and some are even doubled up.I'm wondering if i can hook up a 100amp subpanel off of it? If so what size wire to go with? It would be on ...
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1answer
94 views

tankless water heater

I am looking at adding a tankless water heater but I don't have enough spaces in my breaker box for the breaker requirements of the heater. It is asking for 3 double pole 40 amp breakers and I am ...
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2answers
605 views

Does the metal receptacle box for 6-30 NEMA need to be grounded?

I have a 240 VAC portable heater with a 6-30 NEMA-style plug. I am finishing the 3rd floor of our house. I installed a sub panel fed with a 50A service using 6 AWG THHN. Installed a 30-amp 2-pole ...
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0answers
1k views

What size wire should i use for a 125 foot underground run to a garden shed

I want to run a buried 125' line to a 30A subpanel in my garden shed. I will only be running hand tools and lighting. Was planning on using 12/3 from the house to the subpanel. Does that sound like ...
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1answer
74 views

Need to add a sub panel

Moved here a few months ago and the heat pump is junk. It has a 100 amp breaker out of the main box. Thought about putting in a sub panel off of this breaker. Looked at the wire and it is a 3 wire (...
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2answers
276 views

Correcting Electrical Subpanel With Two Unsheathed Hots Going Back To Main Panel

I have a small subpanel fed from my main panel. The subpanel has two (unsheathed) hots (from separate breakers) exiting the top, going back into a wall cavity and then back to the main panel where ...
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2answers
547 views

can I turn a spa panel box into a circuit breaker box

I got rid of the hot tub and have 60A spa panel. Can I purchase guts that would make it a breaker box? Or should I just replace it with a circuit breaker box? I want to run power to my shed. Is it ...
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2answers
321 views

Breaker for my subpanel for the pool keep tripping

I have a pool with a sub panel that has a 30amp breaker for the pump, a 20 amp for the lights that is also connected to a small fridge receptacle, the water heater has two 20amps on it. The main ...
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2answers
182 views

Can I use three-conductor #2 cable for a 100A subpanel if I add ground rod at the subpanel?

We purchased three-conductor 2awg cable. It has 2 insulated wires surrounded by a neutral/ground. This cost $150, and since it was bought by the foot, I don't believe we can return it. Can we still ...
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1answer
115 views

Safest way of temporarily working with a failed 4-wire outbuilding subpanel (one missing hot leg, neutral bonded ground on both ends)?

This is actually a multi-pronged question. I will ask it all and split out what I can as needed. I am renting a remote out building in a rather rustic location on a farm. The power situation here was ...
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2answers
1k views

Best choice for sub-panel and circuits for basement

Can anyone help me spec a sub-panel for a basement renovation? The plan is to run a 6/3 AWG feed from a 60A breaker in the main panel to a sub-panel which will be flush mounted in an interior stud ...
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1answer
79 views

Wire Selection for a detached shop

I am looking for some help in determining the proper size of wiring to run to my detached shop. I wanted to run 100 amps copper at a one way distance of 85 ft. I was told to use THHN 2-#2 hot, 1-#4 ...
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2answers
579 views

Is a 100A breaker adequate for a garage subpanel?

I am a DIYer and want to do this project on my own. I do have a licensed electrician that I can fall back on, and will use at the end of the project to check it, but I'd really like to do this. I've ...
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1answer
1k views

2 pole or single pole breaker to feed sub panel

I want to run wires about 70 feet to a panel that will feed a 30amp rv hook up and a 20amp receptacle. Should my feeder breaker be a 2-pole or single pole?
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3answers
487 views

Running power to an outside shed

In my house I have a main panel with 3-50 amp breakers feeding a subpanel right next to it. The main panel has an opening for a double breaker. I plan on adding a 50 amp 2 pole breaker to the main ...
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1answer
281 views

How to separate the outlets in garage from other outlets in the house

The wiring for one of the 15A circuits for my house includes 7 outlets in the family room, several recessed lights, a 3-speed hanging fan, a chandelier in dining room and 3 outlets in the garage. ...
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2answers
2k views

How do I add a neutral bar to a sub panel?

I am adding a neutral bar to an existing sub panel and need to insulate the mounting screws so I don't ground my neutral bar, any suggestions on what to use?
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4answers
5k views

Can I run a ground wire along the outside of conduit?

I have a sub panel on back of house. From main in garage is three wire. 2 hot one neutral. NO GROUND WIRE. Sub has a single bar used as neutral and grounds. Its bonded to case (Screw in). I will ...
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0answers
32 views

Separate ground/neutral bars in sub [duplicate]

OK..I have another sub-panel question. My sub has a 50 amp gfci that powers (old) spa. Currently this sub panel has a single neutral/ground bar. This bar is bonded, (screw is in), to the metal ...
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3answers
28k views

Is it ok to use a ground rod at a subpanel instead of a fourth wire?

I understand running the neutral wire back to the main service panel and not bonding the subpanel... but running the equipment ground back to the main panel seems to get conflicting answers. If ...